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Last modified
1/26/2010 12:47:12 PM
Creation date
10/11/2006 11:23:45 PM
Metadata
Fields
Template:
Water Supply Protection
File Number
8240.300.31.J
Description
San Juan River - Environmental Studies
Basin
San Juan/Dolores
Water Division
7
Date
7/1/1997
Author
DOI
Title
Finding of No Significant Impact for an Augmentation Plan for Razorback Sucker in the San Juan River
Water Supply Pro - Doc Type
EIS
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<br />o <br />o <br />(:':) <br />.':) <br /> <br />6 <br /> <br />-1 <br /> <br />In March 1994, 15 radio-tagged juvenile razorback sucker were released, five per site, at three <br />stocking sites. These fish were equipped with six-month transmitters that expired in <br />September 1994. In October 1994, an additional sixteen radio-tagged razorback sucker, <br />equipped with 22-month transmitters, were released in equal numbers at these same three <br />sites. In November 1994, 656 PIT-tagged razorback sucker were also stocked in equal <br />numbers at four sites, the three above mentioned and RM 158.6, to allow for greater <br />probability of recapture during monitoring. In September 1995, anadditional 16 radio-tagged <br />razorback sucker, equipped with 22-month transmitters, were released at RM 158.6. All <br />stocked fish were F1 progeny of adult razorback sucker from the San Juan River arm of Lake <br />Powell. <br /> <br />The 1996 stocking effort used 300 razorback sucker from the Wahweap Warmwater Fish <br />Hatchery facility operated by the Utah Division of Wildlife Resources. Ten of these fish were <br />surgically implanted with 13-month transmitters. All 300 fish were stocked at RM 158.6 in <br />late September 1996. <br /> <br />The experimental stocking efforts have established that hatchery-reared razorback sucker can <br />survive in the San Juan River, and that suitable habitat is available to support adult fish <br />throughout the year (Ryden and Pfeifer 1995 and 1996). These stocked fish are maturing and <br />may spawn in 1997. Eight of 9 razorback sucker recaptured in May 1997 were ripe males. <br />Three of these fish were collected in the same net while electrofishing, and an additional three <br />razorback sucker were observed, but not collected at this same location. This close <br />association of ripe fish suggests a spawning aggregation (Ryden 1997). <br /> <br />C. PROPOSED AREA <br /> <br />The San Juan River and its tributaries form the second largest of the three sub-basins <br />comprising the Upper Colorado River Basin. The San Juan River drains about 38,000 square <br />miles of southwestern Colorado, northeastern Arizona, northwestern New Mexico, and <br />southeastern Utah. From its origins in the San Juan Mountains of Colorado, the San Juan <br />River flows SOrT1e 31 miles to the New Mexico border, 190 miles westward to the Four Corners <br />area, and thence another 136 miles to Lake Powell. In its upper reaches, the river traverses <br />rugged terrain and has a relatively high gradient. The river emerges from canyon-bound <br />reaches shortly after entering New Mexico and flows through a broad floodplain for much of <br />its course in New Mexico and Utah. About 70 miles upstream of Lake Powell, the river again <br />enters canyon reaches for the remainder of its course. The river is generally restricted to a <br />single channel in canyon portions, but is often divided into several channels in floodplain <br />reaches. <br /> <br />The San Juan River has comparatively few perennial tributaries. most of which are in upper <br />reaches. Historically, the Pinos, Piedra, Navajo, Animas, La Plata, and Mancos rivers, Rio <br />Blanco, and McElmo Creek were the only perennially flowing tributaries. Other streams such <br />as Montezuma and Chinle creeks seasonally contributed flows. Numerous washes and arroyos <br />also entered the river, but none provided regular flow. Among tributaries, the Animas River <br />contributed the greatest flow. <br />
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